Benzylnaphthylamin-sulfonic acid and process of making same.



UNITED STATES PATENT OFFICE.

IVAN LEVINSTEIN AND CARL MENSCHING, OF MANGHESTER, ENGLAND, ASSIGNORS TOLEVINSTEIN, LIMITED, OF MANCHESTER, ENGLAND.

BENZYLNAPHTHYLAMlN-SULFONIC ACID AND PROCESS OF MAKING SAME.

SPECIFICATION formingpart of Letters Patent No. 722,861, dated March 17,1903.

Application filed December 22, 1902.

To all whom it may concern.-

Be it known that we, IVAN LEVINSTEIN, a subject of the King of GreatBritain and Ireland, and CARL MENSCHING, Ph. D., a subject of the GermanEmperor, both residing at Manchester, in the county of Lancaster,England, have invented new and useful Improvements in the Manufacture ofBenzylnaphthylamin-Sulfonic Acid and Process of Making the Same, ofwhich the following is a specification.

We have found that a new benzylnaphthylamin-sulfonic acid is producedwhen alpha,- alpha naphthylainin-sulfonic acid is heated with benzylchlorid under suitable conditions hereinafter described. The new acidcombines with diazo derivatives of amidoazo compounds, giving rise to avery valuable series of polyazo coloring-matters which produce on woolshades which are much bluer and brighter than those which are producedby the corresponding coloring-matters from the unbenzylated acid.

In illustration of our process for the production of the new alpha alphanaphthylaminsulfonic acid we give the following example: Sixty-fivepounds of alpha alpha naphthylamin-sulfonic acid are dissolved withthirtyfive pounds of potassium carbonate in one thousand pounds of Waterby boiling in a reflux apparatus, and there is slowly introduced intothe boiling liquor 33.5 pounds of benzyl chlorid, the mixture then beingallowed to boil for eight hours. The new acid is then pre- Serial No.136,266. (No specimens.)

l cipitated by the addition of mineral acid to the liquor and isfiltered off. When necessary, it may be purified by dissolving inalkalies and reprecipitating with acids.

Instead of potassium carbonate an equivalent molecular proportion ofcaustic potash or of caustic soda may be employed, in which case thebenzylation will take place at a temperature of from 30 to 50centigrade, and the use of a reflux apparatus is unnecessary.

What we do claim as our invention, and desire to secure by LettersPatent, is-

1. The hereinbefore-described process for the production of a newbenzylnaphthylaminsulfonic acid which consists in heating alpha,- alphanaphthylamin-sulfonic acid with benzyl chlorid, substantially as setforth.

2. The new benzylnaphthylamin-sulfonic acid which is produced by heatingalpha alpha naphthylamin-sulfonic acid with benzyl chlorid, and which bycombination with diazo derivatives of amidoazo compounds produces onwool shades which are much brighter and bluer than are produced by thecorresponding colors from the unbenzylated acid.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

IVAN LEVINSTEIN. CARL MENSCHING.

Witnesses:

WILLIAM E. HEYS, GEORGE MOHL.

